Where are the files located?
When did this start happening?
Was it working before, and stopped, or has it never worked?
If it was working before, what was changed recently?
If it never worked, try downloading latest ServUO, place in C:\Games\ or another similar directory that you create, NOT in C:\Users\YourName\Downloads\ ... \Desktop\ ... or \Documents\, and not in C:\Program Files\ or C:\Program Files (x86)\